Feeding device



Patented July 19, 1932 WILLIAM A. SMITH, SR., OF EASTON, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAND PATENT- OFFICE COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY FEEDING DEVICE Application filed September 15, 1930. Serial No. 481,840.

This invention relates to feeding devices, but more particularly to a feeding device for percussive motors, such as rock drills and the like, of the type mounted on supporting devices relatively to which they move to assure the proper operative relationship between the motor and the working implement which the motor is intended to actuate. 4

One object of the invention is to actuate the motor relatively to its support by the force ofthe jars imparted to the motor by its hammer piston upon reversal of the hammer piston at the ends of its stroke.

Another object is to assure the continuous actuation of the motor in one direction for moving the motor in the direction of the work or to retract it therefrom.

Other objects will be in part obvious and in part pointed out hereinafter.

In the accompanying drawing illustrating the invention and in which similar reference characters refer to similar parts,

Figure 1 is a longitudinal elevation, partly in section of the feeding deviceshowing it operatively connected to a reciprocatory motor and its support,

Figures 2 and 3 are transverse views taken through Figure 1 on the lines 2-2 and 33 looking in the direction indicated by the arrows, and

Figure 4 is a perspective view of a detail.

Referring more particularly to the drawing, A designates a motor illustrated in this instance as a rock drill andof which only a portion of a cylinder B and a back head G are shown. Within the cylinder B is a reciprocatory hammer piston D to deliver blows of impact to a working implement, such as a drill steel (not shown).

A suitable support is provided for the motor A in the form of a cradle or shell 13 provided in this instance with a rearward extension F which maybe secured to the cradle in a well known manner, as for instance, by sidilrods G disposed on opposite sides of the s e In accordance with the present invention, means are provided to effect the actuation of the motor A longitudinally of the supporting shell E by the jars or shocks to which the motor is subjected upon reversal of the hammer piston D in the extremities of the cylinsupported by the corresponding end of theshell E in the usual manner, that is, rotatably.

The arrangement of the nut H and the screw K is such that in the absence of retarding or restraining means .acting' upon the screw K, longitudinal movement of the motor A along the support E will cause rotation of the screw K.

A support is provided for the rear end of the screw K in the form of a cross head or bearing L seated in this instance against the rear end of the extension F and being retained in position by the side rods G. Preferably a bushing O is disposed within thecross head L to provide a renewable bearing surface for the cross head." I

Means are provided to selectively assure continuous rotation of the screw K in only one direction and thus also to assure continuous movement of the motor A in one direction to either enable the motorto be actuated in the direction of the work or to be retracted therefrom. To this end a toothed ratchet wheel P is disposed on the rear end of the screw K on which it may be keyed or otherwise secured and a nut Q, threaded on the extreme end of the screw Kserves to clamp the ratchet wheel against a shoulder R on the screw K to maintain said ratchet wheel against longitudinal movement relapawls of each pair are disposed on diametri- Y cally opposite sides of the ratchet wheel P and each pawl has a cylindrical portion or trunnion V which is journalled in a correspondingly shaped recess W in the casing S.

pawls to be selectively moved out of engagement' from the teeth of the ratchet wheel P solthat the other pair'of pawls may .act as abutments for the ratchet .wheel and thus prevent recoil of the motor A when the piston D=reverses its direction-of travel in one end of the cylinder B, a sleeve bis arranged in the casing-S coaxially with the'ratchet wheel P and said sleeve is provided with a pair of arcuate wings a which lie over the periphery of'the ratchet wheel P and extend between the pawls T and U. The sleeve is rotatable in the casing and upon rotation thereof either pair of pawls may be moved out of engagement from the ratchet wheel P or may be released to enable their ,respective springpressed plungers to press the said pawls into engagement with the ratchet wheel P. The- Wings '0 are of such width that in the neutral or intermediate position of the sleeve 6 the wings a will be out of contact from the -pawls so that all'of the pawls may simultaneously engage the "teeth on the 'ratchetwheel P. A rib or projection ion the sleeve b affords a convenient grip. portion wherebythe said I sleeve maybe rotated.

40' able that the movement of. the motor A rela- In the casing S may be arran ed a springpressed plunger (1 to enga e epr'essions e in the sleeve 6 for maintainlng the sleeve in either of its' limiting positions or the neutral position- During certain stages inthe operation of devices of this character it is at times desirtively to its support may betosome extent retarded. This is particularly the case when first starting a drill hole and also whenever soft rock is encountered and in which'lattercase the working implement would be rapidly driven throug'hthe rock so that only a v as rifled drill hole would be formed. This is of;

course objectionable. In'order, therefore, to assure against a too rapid advancement of the motor A on its support the screw K is*pro-- vided 'with an enlarged cylindrical. portion g, preferably'loca'ted at a point forwardly of the cross head Land "a guard 72. which may i as illustrated, within tion of the extension F. Encircling the cylindrical. portion'g'is a brake band I: to which is secured a friction band 0 of,suitable braking material The brake band It is of the resilient expansible type so that when released it will expand-to remove thefriction band 0' outof contact thesurface of the cylindrical portion g. One end iof the brakeband 7: which may be in the form of a loop 12, anchored pver 'ton may be efiectively orman integral porwill thus continue until. the workin ment has. been driven into the wor to the newness;

a pin 9 inserted inv the guard 72. and inithis instance extends through a slotr in the opposite end of the handle, thus serving to main-. tain all portions of the bandsls and o in substantially the same transverse plane.

- Convenient means are provided to effec contraction of the bands is and 0. To this end a bolt 8 isdisposed slidably in an aperture t of the guardh, .and said bolt has a hook it which extends into the slot 1' to engage that end of the band is. The bolt 8 is disposed slidably in the aperture t and on the threaded portion 12 of the bolt is a threaded thumb nut w which seats against guard h.

The operationof the device is as follows: Let it be assumed that the motor is in oper-- ation, that is, that the hammer piston l) is a surface :0 of. the so reciprocating within the cylinder B to de-- 7' liver blows against the working implement.

With the motorthus operating it is of course essential that it be kept within the proper operative position relatively to the w0r-k1ngim-' so that the force of theliammer pisapplied to the working implement. for driving it into the work. n In order toassure this desirable position of the motor, 'the sleeve 6 may be rotated in a' clockwise direction, as F igure 2 is viewed, to trip the 'pawls T out of engagement from'the plement ratchet wheel P. Only the pair of pawls designated by U will ,then remain in-the en:

gaging positions to act as abutments for the teeth of the ratchet wheel P.

During the subsequent operation of the motor A and at the end of each forward stroke of the hammer'piston a ar will be imparted to the motor of'sufiicient force to move the motor bodily in the direction ofithe work. Upon each-forward movement of the motor the screw force transmitted through the nut' H, and the motor will therefore be gradually advanced towardsthe work in accordance with the degree of penetration of the working 1m-- plement into the work. Y a During the return .or rearward stroke of the hammer piston D a similar ]ar or shock is, of course, also imparted to themotor, but

limit of its extentor until the operation is completed, whereupon the sleeve bmay be rotated in a counter-clockwise .direction.

The wings a will then release the pawl's T which will be actuated into engagement with the teeth. on the ratchet wheel P by the.

plungers acting thereaga'inst.v

Upon continued rotation otthe sleeve I) I K will be-rotated somewhat hy'the at this'point in the cycle v in this direction the pawls U will be tripped out of engagement from the ratchet wheel P. Meanwhile the hammer piston D may continue its reciprocations and in the new positions of the pawls, the pawls T will then act as abutments toprevent counterclockwise rotation of the screw K. In consequence, when the hammer piston D reverses its direction of travel in the rear end of the cylinder B, the screw K will be rotated in only a clockwise direction and will be held by the pawls T against counter movement when subjected to the shock imparted to the motor by the hammer piston D upon the reversal of its stroke at the front end of the cylinder B.

Continued operation of the hammer piston D will then cause the motor A to be retracted to its starting position. After the motor reaches its rearmost limiting position, the sleeve 6 may be rotated to the neutral position to enable all the pawls T and U to engage the ratchet wheel and thus hold the motor against.any form of movement relatively to the support until the sleeve 6 is again rotated to trip one or the other of the pair of pawls out of engagement from the ratchet wheel P.

If, during the operation of the apparatus,

it may be found desirable to retard the movement of the motor A relatively to its support, the braking device, such as the bands is and 0, may be retracted into frictional engagemotor is slidably mounted, a reciprocatory hammer piston in the motor imparting jars thereto to move the motor relatively to the support, of recoil resistance means operatively connected to the motor and the support and comprising .a pair of members in threaded engagement with each other and one of which members is adapted to be rotated by the motor upon movement of the motor on the support, and brake means adapted to contract on the rotatable member for controlling rotation thereof.

2. In a feedingdevice, the combination with a motor and a support whereon said motor is slidably mounted, a reciprocatory hammer piston in the motor imparting jars thereto to move the motor relatively to the support, of recoil resistancemeans operatively connected to the motor and the support and comprising a pair of members in threaded engagement with each other and 'one of which members is adapted to be rotated by the motor upon movement of the motor on the support, brake means encircling the motor upon movement of the motor on the support, a friction band encircling the rotatable member, a' resilient band secured to the friction band and being expansible to remove the friction band from contact with the ro-. tatable member, and means for contracting the bands on the rotatable member to control rotary movement thereof.

4. In a feeding device, the combination with a motor and a support whereon said motor is slidably mounted, a reciprocatory hammer piston in the motor imparting jars thereto to move the motor relatively to the support, of recoil resistance means operatively connected to the motor and the support and comprising a stationary member and a rotatable member in threaded engagement with the stationary member, said rotatable member being rotated by the motor upon movement of the motor on the support, a ratchet afiixed to the rotatable member, a plurality of pairs of abutment means arranged radially about the ratchet, the abutment means of each pair lying on diametrically opposite sides of the ratchet springs for actuatin the abutment means into engagement with file ratchet, and means arrangedfcoaxially with the ratchet for controlling the abutment means to permit engagement thereof in pairs with the ratchet for controlling the direction of rotation of the rotatable member and thus also the direction of movement of the motor relatively to the support.

5. In a feeding device, the combination with a, motor and a support whereon said motor is slidablymounted, a reciprocatory hammer piston in the motor imparting jars thereto to move the motor relatively to the support, of recoil resistance means operatively connected to the motor and the support and comprising a stationary member and a rotatable member inthreaded en agement with the stationary member, said rotatable member being rotated bv' the motor upon movement of the motor on the support, a ratchet aflixed to the rotatable member, a plurality of pawls arranged in pairs and the pawls of each pair being arranged on posite sides of the ratchet, springs for pressing the pawls into interlocking engagement with the ratchet, and means rotatable about the ratchet wheel for selectively tripping either pair of pawls out of engagement from the ratchet thereby enabling another pair of pawls to control the direction of rotation of the rotatablemember.

6. In-a feeding device, the

combination with a motor and a support whereon said motor is slidably mounted, a reciprocatory 11ammer. piston in the motor imparting jars thereto to move the motor relatively to the support, of recoil-resistance means operatively connected to the motor and the support and comprisin a stationary member and a rotatable mem er in threaded engagement with the stationary member, 'said rotatable member being rotated by the. motor upon havin movement of the motor on the support. a ratchet aflixed to the rotatable member, a sleeve rotatable relativel to the pawls and wings to trip the pawls inpairs, where y upon rotation of the sleeve either pair of pawls is selectively tripped out of engagement from the "ratchet an the ratchet with a motor and a support whereon said I motor is slidab'ly mounted, a reciprocatory hammer piston in the motor im arting jars thereto to move the motor relatively to the support, of recoil resistance means .operative y connected to the motor and the support and comprising a pair of members in threaded engagement with each other and one of which members is adapted to be rotated by the motor upon movement of the motor on the support, brake means adapted to contract on the rotatable member for con-- trolling rotation thereof, abutment means for the rotatable member, and trip means to control the abutment means for-controlling the direction of rotation of the rotatable member. i

In testimony whereof I have signed this specification. WILLIAM A. SMITH, SR.

abuts against the other pair of pawls to pre support, of recoil resistance means operatively connected to the motor and the support and comprising a stationary member and a rotatable member'in threaded engagement with the stationary member, said rotatable member being rotated 'bythe motor upon movement of the motor on the support,

. a ratchet affixed to the rotatable member, a

plurality of pawls arranged in pairs about the ratchet, the pawls of each pair'being disposed on diametrically opposite sides of the ratchet, springs for. pressing the pawl; mto engagement with the ratchet, and means for selectivelytripping either pair of pawls but ofengagement. from the ratchet to conmember,

-8. In a "feeding device, {the combination with a motor-and a s'upport'whereon said motorfis slidably vmounted, a reciprocatory hammer piston in the motor imparting jars there-- to to move" the motor relatively to the su port, ofrecoilresi'stance means operatively connected to'the motor, and the support and comprising a pair of members in, threaded trol the direction of. rotation of the rotatable engafiement with each other and one of whic jm'em'bersis adapted to be rotated by the motor upon movement. of the motor on the support, brake means adapted to con? tract 'on the rotatable member for controlling rotation thereof, and means for. controlling the direction- 0f rotation of the rotatable member. 1

9. In a feeding device, the combination 

